Hello, Here is the documentation updated regarding the requests made above. Error handling customization is now explained with an example. I describe a call with a user_error policy, and also the use of the BOOST_MATH_OVERFLOW_ERROR_POLICY macro. However, I don't show any example of use of a try/catch block with the default call, because using try/catch is a widely known C++ practice so I assume that the user knows what he has to do when I say "by default a std::overflow_error is thrown". Do you think such a trivial example should be present anyway? By the way, there is a slight error in this page: http://svn.boost.org/svn/boost/trunk/libs/math/doc/sf_and_dist/html/math_too... The first line of the first code section opens the namespace "policy" instead of "policies". Let me know if there's anything to modify again. What about the possibility of allowing a return type compatible with Boost.Units and/or possibly integral ? I see 3 solutions: - a return type policy in second template argument (with the current one as default) - a completely different function name - nothing at all (stick to the standard and nothing else) Regards Bruno